Objective To explore the correlation between the health of women's vagina and vaginal cleanness, clue cells and bacterial vaginosis(BV)which is tested by the sialic acid enzymatic method. Methods Randomly select 835 suspected cases of bacterial vaginosis in our hospital gynecology department in April 2013-June 2014. Every case was respectively done saline direct smear and vaginal secretion direct smear gram staining to check vaginal cleanness and clue cells. BV is tested by sialic acid enzymatic method. Results The cleanness of I-II accounted for 27.55%, BV positive rate was 2.40%, the positive rate of clue cells was 1.32%;the cleanness of degree III-IV accounted for 72.45%, the positive rate of pathogenic bacteria was 46.23%, the positive rate of BV was 30.55%, the positive rate of clue cells leads to 23.48%. Conclusion The rate of abnormal vaginal cleanness is higher than the normal.The nomal vaginal cleaness does not show no bacterial vaginosis. The emergence of BV seriously affects women's health, so the correct diagnosis is of great importance. Although the of the saliva acid enzyme to test BV is fast, operates easily and the color results are easily to be judged, but it can be influenced by other factors such as temperature, time, materials issues.